Anyone interested in a portable brief case sized 3D printer. Ben Heck shows how he made one.
http://youtu.be/xJndXebTG9I
@Colin_Faulkingham won his dual-bed, dual-extruder one, and to say it was shoddy is probably an understatement. Eventually it got salvaged for parts. Ben Heck is an awesome hacker, but a lot of these things end up purely for show, if they work 1 time in front of the camera, then it’s considered good. Though I must say this is probably one of his better builds.
tisk tisk, constraining the opposite end of his z axis screws.
@Anthony_White why does everyone hate on constraining z. With a straight lead and good tolerance on the constraint location I don’t see the issue. It’s working fine for my machine.
I am just wondering.
@Eclsnowman if you already have perfectly straight threaded rods, then constraining them on each end isn’t going to make a difference at all. However, when they are not straight, like most threaded rods, the additional constraint will over-constrain the rod and transfer forces into the X-ends. Which increased z-wobble instead of decreasing it.
With bent rods that are only constrained on the motor side, the other end will look like it’s wobbling more, but in fact it will transfer less of that wobblyness into your x-axis.
@Eclsnowman They are never 100% straight cut threads, constraining them will add Z-Wobble.
This is also kind of a silver lining for builds that are now using M6 or M5 threads for their Z axis. The threads are now so small that they don’t overpower the 8mm to 10mm Z linear rod…even when people do dumb crap like throw each end in a tightly held bearing.
@ThantiK You would always have play in the bearings.
@Ashley_Webster I should have double-constrained the Z screw on my TITAN design. But I do not know if that would have solved all the issues.
But the TITAN design uses a gear transition from the motor to the Z screw, which is the source of a lot of problems.
(The TITAN is a 20x20x20cm printer, with a build volume of 8x8x7cm. But it has some problems. And as working at Ultimaker is taking a lot of my energy these days I never got around to fix it)